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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa19321bb3145701d59e3a294327cf19957036da0d9cc66f16f702c03b098fef' 
  AND token = '9AT4afg9SN892UB+pIMRNvNwk/N8rvP7akLkr3JEP+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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