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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f55cbf89cb5bd285515c72f9d4dd10f8eb161e8490aefd5ad8bd068f4f5f5' 
  AND token = 'yIGLoOXGnxtg6teZHATpW5gJfzK1bII0BzmAh8eP278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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