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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2202268084fe4aab6bb4530745eb2904a29d4c2b6f184eefa6e3c610145c663' 
  AND token = '8FVogSfpl9vEkfmL8mlXO9mHKhEYczL3iHHVvenyYx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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