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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbc3b324af67a89fac29711e9141b2e9f2a3fe36078b9dcfd8750960e19997f' 
  AND token = 'LqabOp4vDwC7kXlUfjURDKxUsduTj3tSj8jX9cpw4F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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