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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47e4e4d6f46865a3bb3b7f3a4f5075afc9f4b31f6139dc3ca6c4dc439719847' 
  AND token = '7EUbPRbRNsdm7FMJ9NdEF35EoZ9jPvDni7YTWPEzqU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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