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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00aa1aade393c395d5f54299daf0c6f6f791553d3609bf4acb7baf637291257' 
  AND token = 'kiuIyxodkfjzou3gVd/CSbjISBoCNrqQOCfFVACuFyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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