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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95987a652d3d6dd148abe8990843f76ca2695fcf91b425e13cc5fe69fe62b4c6' 
  AND token = 'nSgN2TY2xn9/8fJqKx4pUiz0kq2eY8ur+llZ/qoXWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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