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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26efda04372b30aac53d150006676d02a2513c1f0e30d51c2cb9bad419f9c25c' 
  AND token = 'sR+QZUCmHNkYlUi6ZcOYexgQOUKxqgMU70f+BcsrssI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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