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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b96daefdfd6546c361d0b590a0dfc86b87d4b8a5ab63774f38c30c3950179f' 
  AND token = 'C0Uab9cUIESvSQCuu1ZsgLDZDuEGDtWFeP8AElnEzpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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