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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4d90c30282a9ac37a840bbfdccc17d21ec54bb96c5f0bca7ed8c18a598380b' 
  AND token = 'l15ueg1+TZ/f3iWr6hHhy63wwh6XMJykHxEHsUL+CEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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