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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ca1fcddaf620e3e280bf5a2de2ec126561922bf3a9ecacbb8ab53dee00af68' 
  AND token = 'gjYsoqFLQ6xgju1edj6LAjST8bnoGLvDkthXLUlPUrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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