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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696d1bfa267965f631b6c6a8efe68737dff96f901489cf59869f863ffa45c8ab' 
  AND token = 'jJ+5w6HPrY7gfwd2QQ8LH4TYbZ5S+1qlxhPMmANRrsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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