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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9d8d4ae453d06f07794d2568f26ce7811badc8171e493e1633642f723ba761' 
  AND token = 'nb2zpouGAdT6T+n1+AniQuRZwoaBTi7nItBAF3GBjUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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