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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c192841b406751285dc9652fd2fe16eba832cea933686c1117843602f075d9' 
  AND token = 'J4NP8yLMF61iYYVKY6M4hhOzF4prgqh/WNcVaP8K75E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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