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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074f050c9cce24d369ad1ee5cf4241b8b81d99c79d7eb0ceecdae697af5c83f1' 
  AND token = 'jaRTvpmwFjgHbtblhu6JkZxHRFF38X6AXwsL2qRTMyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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