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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb7df13dbd1d16255b0e5cc1b8d6dc3fb914040a668cf9cb0c6c01df1f3bc1d' 
  AND token = 'v9edfRjRor+utL+R30ux26wTF05jfA18G6LLbJ10Eq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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