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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa96b83853900ebdfde05da31081b594e9f378565db1dfdfbe4f445821bb5940' 
  AND token = 'NbljbTlup0JcjvM0/l5P561ckPwzpNX+//nn9CpNI6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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