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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3e5d73995e5f3b10d9b973443e47974fe69538ebb1d9e5b2648737fcd38616' 
  AND token = 'm79ucqQrO0gCgJuV1nU4zQhaXrvcWcYBlO5cJENxcg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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