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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bb117a1dfebb738efcdc4d2e770616913a19adf038a59c8c97073c897a011b' 
  AND token = 'jX2peFjZ9Pj5d3ROLSvNA0rfNRFIGEsXcLKL2CW1EkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}