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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6671faf5d1fc898c6d372dec6fc0a3b754736b0785d8eeced4b6fb36cbfe97c5' 
  AND token = 'rJR3nyY2AKXnSJop8PZwDz0g1nUTUHklW86TzaP38YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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