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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fe35b708df717f29b8d6facf16af44205d49d647dabc321dec91fda6c78d31' 
  AND token = 'af1u6/JtT+aFWJANOAycbK9qLEyi/LAjOJhUnCcikHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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