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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76505c46ad4177bd5f8c07f43e3594f17ef1cdc387cceaa968b79134426e09a' 
  AND token = 'mBWc+nkoXu8EKppSNkOGLt/6p/qG9o87uzHjAze7MO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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