SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266229bbb364ac173af9dc97eb3861085d7b88d695e3ee8fce954f3e1b08db74' 
  AND token = 'sC2XpM/sqWwG7Su3a/bOpEGEvj0gRK7EzH2hAFwaz1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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