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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431772e93b4e58aefb416e707afdb3f09910103ad726118d7122e88a1f521a24' 
  AND token = 'Xt4pAodR5ECY+H6p9tgAmZ0hy31wk9X+APGzh51yFz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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