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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc7d7de573c60c4d2f449a7d33f4208db8fecd295a6fb06daa46b0e04c5a624' 
  AND token = 'jjJEdlLP4wvJBUTGs6iWQZ7sHEtnHkoBvRECetgklGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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