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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce16ab073e03144329f1d7a9da257b58efe15211ff20dad3dcfc2da0c1e8875' 
  AND token = 'yLQb0Ona7Z7b697UncZv8Oa5NJZHELOXMQeLOek7XAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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