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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8239fe07d971fc0f62ba48b040b6412b07a82b6efa3d05912d40f398780d712b' 
  AND token = '1uh7d/bTAfzmN4f7+zJIAbwRMcz/9kyxv0NJ4zSBrLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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