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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525e288e8c0e57181084907ef5d3477493b35c3fc2d5fb8f6088f1fd55c50214' 
  AND token = 'bqMWD273PGIBN5Eh9s0/XU60VoPlgOulM2EcaOYJYkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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