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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bb9a72b691da05206363c2c012a37cae311295bf818fee4f2b568ce2237e02' 
  AND token = 'bp482lgxSjG/x4A7nmjnXSt2vC3rBCgYi242J2FcHJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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