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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1072d8034e469c3f40fbe0367517af08e30648132a71a80bfacbc3d27029e8' 
  AND token = 's54QJ9hOyt5sMw9X73GUFDHc3k8qatwKwJu+VWVwGMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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