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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36efeab6e2c8dd66d96c838c36ac018ff495e0e3d7602c36148ab21472af6bcd' 
  AND token = 'O+AEwLlfAsEcJ5qR7qa9exglpFFj5/U3In7oBSdXiRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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