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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bd5f378b505294dbbf06c19e80f9588c33648534972c2cdd03a2e6e6afa3da' 
  AND token = '1b/YP+u/jRLZA201ayCMWo1TJ3IP2hl4LlD/P8h0AQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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