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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295ab1e63582cb1dd4f9095da38bf0887c69f7ff3fd579c1d4785b89b820cd1b' 
  AND token = '2G7Edubf3HLmvkGc5d7DbGeTRR1ho7T0Sz0mhoHRhBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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