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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d801cdaff42ed428d65af49ebf3cf79c1eb8554076f10055551811525ffa842' 
  AND token = 'Y/O1ljBHkQJ0AiaW9l8tR4NxO8YjW7mILV7oOMBnQjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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