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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38b13725c3f72d9a9a987e5a1194cdb774105b7f2cb4a3aacf66dc0ba3d0ff8' 
  AND token = 'qWypyLsRALyakZHQe0HDp8UWHCPaK1I2Noxzth8yI80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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