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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2b4abe55709a97e52f720660f096d8e9e6895a9ed4d8085a17066d9ae97f7b' 
  AND token = '5lm38NEmN6gnG3l4H0o/aReU0eSJrWe+63l7191BZpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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