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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214228903c6f56e89abd9bacd63082d439ad9cd236ed1e531cd87584650203a1' 
  AND token = 'BKcosEPE8Ru00Pbtqwpe5gy/3jf6xWmD0NxDkknbin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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