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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa3f0464c15bb4719068e470e33e254f4c7f62ea004bf529fce8e46b61fe370' 
  AND token = 'miH+0qGYiI0TWwZhbCPf+98cnB8nBRx8pXcBNStNmno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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