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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6c915024e42c218e7a69f51db9c375673721550d0bc6cbb4869e2e697b8a4a' 
  AND token = 'EjYngcRoy24KbIcapVApx0YjB7a3w4UFvTwuycSyoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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