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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1da5965d4424fe4df4197a4f39a00adc24152a81ce0c9e103e0984c3c53bd0' 
  AND token = 'Z017Eu6mlUBXgq+ukOcoLlAhE1Nva0HUmWsv9AruzD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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