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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c3350c476ff216f6256ac5b30235f05d8bcc4c7709493d119d558e415a3a97' 
  AND token = 'KGUh4GuovX0X5matG/tczw3ooNHJ00lwBDjc7Ro0o8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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