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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1931108df5bad897c6eb8c8c47f9876aa16f6abcc064b5db40ea6c5bb7185506' 
  AND token = 'E7WGGwv5QNg0wWaUQ2WKsCkwsHpquyz8g39N4Ui0X5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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