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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312cad5ae668a304ad5298ccbb5c6ca501789049830e51c3d6adc0b834f1ed83' 
  AND token = 'FwCS1jeYDRO9ba0CgAB9iExL/Tz+KraPy1d4UokegEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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