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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e5c76d84f8d323c1d94f281f07dcff32ce57190aae0b0ebb4187e0476f6e4e' 
  AND token = 'N5QVcEojOtmQcI8W5Jib6qEdGh+aNQO6cjva+KOJ57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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