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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c38eef72872b76699afcdb2ad578160653e143de0e15c4ad9589c3182f0d4c' 
  AND token = 'iVnGQF89lx2RxyEr9AowO5894oH0+u+WskPZyW085+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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