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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813d6a1da9ca81eba183a337d8f38e07199815fefcf112c270cd6dcb32e28524' 
  AND token = '5W0coEk7HRItiXyZIQ+imiKI03N+iE6IUZHnG4v6NHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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