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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b7120e71481be38231462da2c292ab5a062cf7e7a51f4907d2d113d6d5e769' 
  AND token = 'U/kFTHc4EKZP9JPY44WaR3zBC+5tlFn0nyMijaogzHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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