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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca40312301b3ecd88994faefed8382ba0bcbe6ad20f6475d0bef9b82db1da3f7' 
  AND token = 'iORLj2jpybjkh6u7Tmeqc4rvrEc9eysJKQm5ElPHcnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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