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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bce8b97f827350188a37882dd56cd6a35c2ff04863d9f7e338b35e08ef4b3cb' 
  AND token = '9z38rFmnvVMgv4fnYDQ4HXFq4R3Wqcf3yXt+nAj8Fog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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