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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe8b02158081e913649c5e0a248072d9af71b23ca1204c2184c755f463c36f7' 
  AND token = 'So8NuT/U+s/agiL3gol4keyPFl580Pm8q7U4TbB66VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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