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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da595a8a111ed7989a338f32cb3c462b7bd76e3a95dba363c3e5a6371488af0a' 
  AND token = 'L+hBPEKVxVU/jkXbSLuKwLja+W8wayUYy26tXleCVWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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