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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b29030b3883b6b7c01e34855d3bdb40069ab6d95452e2db9627cb0dbaab04a7' 
  AND token = '3OLV1gPMX9iHPSKtfHMDDe9TGGMlzsevIIxBC555Aco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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