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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787a7dca63deae711bffc0e6d67edff71f41d99e36233543810c0181c34c9380' 
  AND token = 'j3u7uL3BoUH+q2Di/0OTCkNPLOK3MSdJpnEb9elAGUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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