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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca431785f96207fc946395ad06d719cd743395f8c7e97744126e64be7f89acc4' 
  AND token = 'JH0QO71rKkKwHG4V6mRXp9EXzES5TB//m1UlxQVYf7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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