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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597b002bea11fa63a0f1bce827cab56491a85846c104263158c54f6dde3ec471' 
  AND token = 'Ye59m7p4bNrK+5PEceEbqtONqnF+SrG2dprvz/r68Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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