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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524322a49e9717c1887bc76c64e8061f27de1363ab8905405193f7dbc68e9c6c' 
  AND token = 'Cz4MCd+ILNvuh1786++qDSzownx64ylCAXGN2di94kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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