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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c264afa81d2d804f579a7343d6f135e6933fa63311835a996d813e3d5b81e07d' 
  AND token = 'pryf7MFGwsKMQI5AKcwdGnuvAOfyJpgZI2hfG8C5t9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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