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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d300482c2747b31423f99fbfe9a43baa0b9cd731c56bf46d271a2f01b5fb0d7' 
  AND token = 'vNYiOH1Nhrcq/nhnHdilNi/DRxnxB08aINCG5as4LI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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