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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276d13fe86b6533cfdfda05fd2a3f2a080d11c7c8df1ada44f375b4469fdd59e' 
  AND token = '6B+q8YFg1fnsaUfMhnF9kylxC5AuE+5EJNXab/Byj5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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