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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d3f7f22621663fe327b0c4cd7cc1d4ef26846288300841f42e7e893a812182' 
  AND token = 'sJJ6/bciFj4OUmj8o82gS9RQ+jDOzzPMdsKWkxKROc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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